Procedure

Preheat oven to 325°F.Salt and pepper lamb shanks. In a large heatproof casserole dish, heat olive oil until very hot. Sear shanks in hot oil until browned on all sides. Remove from pan and discard all but 2 tablespoons of oil. Add onions and cook until translucent. Then, add garlic and cook 30 seconds more. Stir in wine and simmer for 5 minutes. Return shanks to pot; add tomatoes, broth, bay leaf, olives, raisins, chili powder and cumin. Heat to simmer; cover and braise in oven at 325°F, 1-1/2 to 2 hours, until tender (170°F). Drain liquid into smaller pan and skim fat. Cover shanks and keep warm. Reduce liquid to sauce consistency and season with salt and pepper. Arrange shanks on serving platter and garnish with sauce.